#
# Copyright (c) 2014, Lambo Wang, All rights reserved.
# Use of this source code is governed by a GNU v2 license that can be
# found in the LICENSE file.
#
# Logs:
# Transplant to system by Lambo Wang, 2012-11-28
# Add function of get cpu state and get memory state by Lambo Wang,2012-11-29
# first add to Git of OSChina,2014-10-24 by Lambo Wang
# support for psutil(v3.2.2),2015-11-12 by Lambo Wang
"""
Shows real-time system statistics.
Author: Lambo Wang <lambo.wang@icloud.com>
"""

import sys
import os

import atexit
import time
import psutil

print "Welcome,current system is",os.name," 3 seconds late start to get data..."
time.sleep(3)

line_num = 1

#function of Get CPU State;
def getCPUstate(interval=1):
    return (" CPU: " + str(psutil.cpu_percent(interval)) + "%")
#function of Get Memory
def getMemorystate():
        phymem = psutil.virtual_memory()
        line = "Memory: %5s%% %6s/%s"%(
            phymem.percent,
            str(int(phymem.used/1024/1024))+"M",
            str(int(phymem.total/1024/1024))+"M"
            )
        return line
def bytes2human(n):
        """
        >>> bytes2human(10000)
        '9.8 K'
        >>> bytes2human(100001221)
        '95.4 M'
        """
        symbols = ('K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')
        prefix = {}
        for i, s in enumerate(symbols):
                prefix[s] = 1 << (i+1)*10
        for s in reversed(symbols):
                if n >= prefix[s]:
                        value = float(n) / prefix[s]
                        return '%.2f %s' % (value, s)
        return '%.2f B' % (n)


def poll(interval):
        """Retrieve raw stats within an interval window."""
        tot_before = psutil.net_io_counters()
        pnic_before = psutil.net_io_counters(pernic=True)
        # sleep some time
        time.sleep(interval)
        tot_after = psutil.net_io_counters()
        pnic_after = psutil.net_io_counters(pernic=True)
        # get cpu state
        cpu_state = getCPUstate(interval)
        # get memory
        memory_state = getMemorystate()
        return (tot_before, tot_after, pnic_before, pnic_after,cpu_state,memory_state)

def refresh_window(tot_before, tot_after, pnic_before, pnic_after,cpu_state,memory_state):
        if os.name == 'nt':
            os.system("cls")
        else:
            os.system("clear")
        """Print stats on screen."""


        #print current time #cpu state #memory
        print(time.asctime()+" | "+cpu_state+" | "+memory_state)

        # totals
        print(" NetStates:")
        print("total bytes:                     sent: %-10s     received: %s" % (bytes2human(tot_after.bytes_sent),
                                                                                                                                            bytes2human(tot_after.bytes_recv))
        )
        print("total packets:                 sent: %-10s     received: %s" % (tot_after.packets_sent,
                                                                                                                                            tot_after.packets_recv)
        )
        # per-network interface details: let's sort network interfaces so
        # that the ones which generated more traffic are shown first
        print("")
        nic_names = pnic_after.keys()
        #nic_names.sort(key=lambda x: sum(pnic_after[x]), reverse=True)
        for name in nic_names:
                stats_before = pnic_before[name]
                stats_after = pnic_after[name]
                templ = "%-15s %15s %15s"
                print(templ % (name, "TOTAL", "PER-SEC"))
                print(templ % (
                        "bytes-sent",
                        bytes2human(stats_after.bytes_sent),
                        bytes2human(stats_after.bytes_sent - stats_before.bytes_sent) + '/s',
                ))
                print(templ % (
                        "bytes-recv",
                        bytes2human(stats_after.bytes_recv),
                        bytes2human(stats_after.bytes_recv - stats_before.bytes_recv) + '/s',
                ))
                print(templ % (
                        "pkts-sent",
                        stats_after.packets_sent,
                        stats_after.packets_sent - stats_before.packets_sent,
                ))
                print(templ % (
                        "pkts-recv",
                        stats_after.packets_recv,
                        stats_after.packets_recv - stats_before.packets_recv,
                ))
                print("")

try:
        interval = 0
        while 1:
                args = poll(interval)
                refresh_window(*args)
                interval = 1
except (KeyboardInterrupt, SystemExit):
        pass